<template>
  <div class="component-upload-image">

    <VueDraggable ref="el" v-model="fileList" @end="onEnd">

      <!-- 使用element-ui el-upload自带样式 -->
      <ul v-for="(item, index) in fileList" :key="index" class="el-upload-list el-upload-list--picture-card">
        <li class="el-upload-list__item is-success animated">
          <el-image class="originalImg" :src="item.url" :preview-src-list="[item.url]" />
          <!--           <el-icon>
            <Close />
          </el-icon> -->
          <label class="el-upload-list__item-status-label">
            <el-icon class="el-icon--upload-success el-icon--check">
              <Check />
            </el-icon>
          </label>
          <span class="el-upload-list__item-actions">
            <!-- 预览    -->
            <span class="el-upload-list__item-preview" @click="handlePictureCardPreview(item)">
              <el-icon>
                <ZoomIn />
              </el-icon>
            </span>
            <!-- 删除    -->
            <span class="el-upload-list__item-delete" @click="handleDelete(item)">
              <el-icon>
                <Delete />
              </el-icon>
            </span>
          </span>
        </li>
      </ul>
    </VueDraggable>
    <el-upload
      :disabled="disabled"
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :before-remove="handleDelete"
      :show-file-list="false"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
      
    </el-upload>
    <view v-if="isShow">{{ isShow }}</view>
    <!-- -->
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
      v-model="dialogVisible"
      title="预览"
      width="800px"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { listByIds, delOss } from "@/api/system/oss";
import { ref, onMounted } from 'vue';
import { VueDraggable } from 'vue-draggable-plus'
const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 500,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 50,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg","gif"],
  },
  
  // 是否显示
  isShow: {
    type: Boolean,
    default: false,
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: false,
  },
  // 是否禁用删除
  disabled: {
    type: Boolean,
    default: false,
  },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + "/system/oss/upload"); // 上传的图片服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
);
watch(
  () => props.modelValue,
  async (val) => {
    if (val) {
      // 首先将值转为数组
      // let list;
      // if (Array.isArray(val)) {
      //   list = val;
      // }
      // else {
      //   await listByIds(val).then(res => {
      //     list = res.data;
      //   })
      // }
      // // 然后将数组转为对象数组
      // fileList.value = list.map(item => {
      //   // 字符串回显处理 如果此处存的是url可直接回显 如果存的是id需要调用接口查出来
      //   if (typeof item === "string") {
      //     item = { name: item, url: item };
      //   } else {
      //     // 此处name使用ossId 防止删除出现重名
      //     item = { name: item.ossId, url: item.url, ossId: item.ossId };
      //   }
      //   return item;
      // });
      const list = Array.isArray(val) ? val : val.split(",");
      // 然后将数组转为对象数组
      fileList.value = list.map((item) => {
        if (typeof item === "string") {
          item = { name: item, url: item };
        }
        return item;
      });
    } else {
      fileList.value = [];
      return [];
    }
  },
  { deep: true, immediate: true }
);
// 上传前loading加载
function handleBeforeUpload(file) {
  console.log(file);
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some((type) => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(
      `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
    );
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    uploadList.value.push({
      name: res.data.fileName,
      url: res.data.url,
      ossId: res.data.ossId,
    });
    uploadedSuccessfully(uploadList.value);
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  const findex = fileList.value.map((f) => f.name).indexOf(file.name);
  if (findex > -1) {
    // let ossId = fileList.value[findex].ossId;
    // delOss(ossId);

    fileList.value.splice(findex, 1);

    emit("update:modelValue", listToString(fileList.value));
    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully(res) {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value
      .filter((f) => f.url !== undefined)
      .concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", listToString(fileList.value));
    emit("filename", res[0].name);
    proxy.$modal.closeLoading();
  }
}

// 上传失败
function handleUploadError(res) {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}

function onEnd() {
  emit("update:modelValue", listToString(fileList.value));
}
</script>

<style scoped lang="scss">
.draggable_image_upload {

  .box-uploader {
    display: inline-block;
    vertical-align: middle;

    :deep(.el-upload) {
      border-radius: 4px;

      /* display flex
              align-items center
              justify-content center */
      .circle-plus {
        width: 24px;
        height: 24px;
      }

      &.el-upload-list {
        &.el-upload__item {
          width: 100px;
          height: 100px;
          margin: 0 17px 17px 0;
          border-color: #e7e7e7;
          padding: 3px;
        }
      }

      &.el-upload--picture-card {
        width: 100px;
        height: 100px;
        line-height: 100px;
        border-style: dashed;
        margin-right: 17px;
      }
    }

    .el-upload-list__item {
      width: 100px;
      height: 100px;
      margin: 0 17px 17px 0;
      border-color: #e7e7e7;
      padding: 3px;

      .originalImg {
        :deep(.el-image__preview) {
          width: 100%;
          height: 100%;
          -o-object-fit: contain;
          object-fit: contain;
        }
      }
    }

    ul:nth-child(6n+6) {
      li {
        margin-right: 0;
      }
    }
  }
}
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>
